CVE-2021-36380Known exploitationPublic exploitNetwork attack vector

Unauthenticated root command execution via diagnostic CGI

Published Aug 13, 2021 · Updated Oct 21, 2025

OS command injection in Sunhillo SureLine before 8.7.0.1.1 allows remote attackers to execute arbitrary commands as root. The /cgi/networkDiag.cgi script places the ipAddr and dnsAddr parameters into a shell command, and its input filter permits $() command substitution. The CGI requires no session cookie, so network access to the web service is sufficient for complete control of the underlying gateway.

CVSS severity9.8
Critical
EPSS probability97.83%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Sunhillo SureLine before 8.7.0.1.1 allows remote attackers to execute arbitrary commands as root. The /cgi/networkDiag.cgi script places the ipAddr and dnsAddr parameters into a shell command, and its input filter permits $() command substitution. The CGI requires no session cookie, so network access to the web service is sufficient for complete control of the underlying gateway.

The record

CVE
CVE-2021-36380
Published
Aug 13, 2021
Updated
Oct 21, 2025
Vendor
Sunhillo Corporation
Product
SureLine
Classifications
CWE-78, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2024Exploitation reportedCISA Known Exploited Vulnerabilities Catalog listing
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <8.7.0.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sunhillo Corporation · SureLineversion=0 <8.7.0.1.1

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 20268
Sep 23, 20262
Sep 24, 20267
Sep 25, 202610
Sep 26, 20264
Sep 27, 202613
Sep 28, 20267
Latest reporting daySep 28, 2026
Latest daily unique IPs7
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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